Experimental Study of Acoustic Efficiency of Sound-Absorbing Structures Based on Conical Fillers

Within the framework of the present work, experimental studies of acoustic efficiency of sound-absorbing structures with conical filler in a “channel with flow” installation at a sound pressure level of 130 dB were carried out. For this purpose, geometric models were developed and samples of sound-absorbing structures were fabricated using additive technologies. According to the results of experiments, the dependences of the acoustic pressure loss coefficient on frequency in the presence of flow were obtained. The influence of flow on the acoustic characteristics of the sound-absorbing structures under consideration was established. It was found that the sound-absorbing structure with a conical filler is practically insensitive to flow parameters compared to a conventional sound-absorbing structure with a honeycomb filler. Regularities of acoustic wave intensity reduction due to interaction of mutually inverted conical cells and interconical space are revealed.